Question

EXPERIMENT 4 FLOW UNDER A SLUICE GATE AND THE HYDRAULIC JUMP 4.1 Introduction The sluice gate provides acenvenient means of flow regulation, especially in irrigation and drairage schemses where low has to be distributed in notworks of interconnected chanmels. The gane is peovided wih a lifting mechanis so at the aperture beeeath it may be set to any desired position When closed, the sperture is closed so that no Bow ca pass through the gale. In this experiment we measure the discharge under the gae and esablish the effectsiva ooefficiest e discharge and determine the comjugale depths acrossa bhydraalic jsmp aperture is superential so dat a standing wave ne sheet of water which emerges from (ydsulie jump) can be fomed downstream ofe gale, and the esperiment is axtended to nay this staang wave and the variation or specifie energy trough . EL V 12g y2 Yi Figare 4.1 Mdraulie jung E.The specific eteray uputrea o at H Depth,VVelocity upstream of gate,C The coefficient of construction,Ve The awenge velocity at oecoerced sections 4.2 Theory The main features of the flaw are given in Figure4.1. The lowhasadepth h and a velocity upstream of the pata. The jet emerging tem the aperture obeight a has a thickness of Ca where Co is the coofficient of contraction. The statie heed across the sperture varies from-a 34

Answer 1

Ans. The reason behind the difference in measured and calculated flow depth ratio are various energy losses which occurs due to presence of silt, friction of wind at the surface, non-uniformity in channel section, irregularity in channel bed due to deposition of unwanted material etc.

Since calculated flow depth ratio is obtained by assuming ideal channel bed which is not practically possible, hence actual flow depth ratio varies from calculated flow depth ratio.